What OS? Are you saying you're switching the audio output in control panel/etc? You're not physically changing any audio outputs, correct?
–
prestomationNov 15 '09 at 22:13

Im running Windows 7. Yes, physically everything stays the same. I just want to know if its possible to have the graphics card and the motherboard sound card outputing audio at the same time or if the PC can only route it through one way or the other.
–
Connor WNov 15 '09 at 22:22

2 Answers
2

As long as you don't have the various outputs muted it should work fine. HDMI carries both video and audio. The last laptop I worked with, an HP with HDMI, was able to produce sound through both HDMI and headphones at the same time. I believe this is what you are asking.

Look at your audio settings, they are either managed by windows or a utility that your manufacturer provided. It will show all the possible audio outputs and you should be able to mute/unmute at will.